TH4976A - Method for controlling air bubbles in material purification processes at vacuum - Google Patents

Abstract

In the process of making molten glass or other materials Similarly, pure at vacuum, air bubble collapse is accelerated by causing the air bubble to accumulate onto the air bubble. Water bubbles Alkali metal compounds Such as sodium hydroxide or sodium carbonate, and their solutions.

Claims (4)

1. a method for purifying glass-like or similar materials; The material at a volume of molten state (51) is contained in the vessel (12) and at the top of the molten material is at a pressure lower than atmospheric pressure to aid in the purification of the material. As a result, there are air bubbles (50) above the material in the container. It is characterized by that there is a deposition on the air bubbles of the material that accelerates the collapse of the air bubble. 2. Method of claim 1, whereby the deflating agent is selected from the aqueous group. The alkali metal compounds. And solutions of alkali metal compounds 3. Method of claim 2 where alkali metal compounds are sodium compounds 4. Method of claim 3 where air bubbles collapse is Selected from the sodium hydroxide group. And sodium carbonate 5. Method of claim 1, where the pressure in the vessel (12) is not more than half the atmosphere 6. Method of claim 1 where the pressure is not greater than 0.13332 bar (100 tor) 7. The method of claim 1 is where the material (51) is to be purified into a soda-lime-silica type glass. And initially provided a source of sulfur as a purification agent in an amount not greater than the equivalent amount of sodium sulfate 2 parts by weight per 1000 parts by weight of the material as zillicas. 8. Method of claim 1 Where the deflating agent is fed continuously onto the air bubbles (50) 9. Method of claim 1 where the deflating agent is intermittently fed onto the air bubble (50). ) 1 0. Method of claim 1 where the material is liquefied before being put into the container (12) 1 1. Method of claim 7 where material (51) does not add sulfur-containing purification agents 1. 2. Method of claim 1 where air bubble deflation (50) is accelerated by spraying water over the air bubble 1. 3. Method of claim 1, where the air bubbles collapse into a liquid 1 4. Method of claim 13 Where the liquid is combustible.